1. Waves
Chapter 12

2. Waves
If we poke a ball floating on water, it will bob up and down (harmonic motion).
The oscillating ball creates a wave on the water surface.
The first ball can make a second ball that is farther away oscillate.
Can you explain the transfer of energy?

3. Why Study Waves?

4. Evidence of Waves Anytime you see a vibration that moves
Anything that makes or responds to sound
Anything that makes or responds to light
Anything that transmits information through the air (or space) without wires
cell phones, radio, and television.
Anything that allows you to “see through” objects
ultrasound, CAT scans, MRI scans, and X rays

5. Transverse and Longitudinal
A transverse wave has its oscillations perpendicular to the direction the wave moves.
A longitudinal wave has oscillations in the same direction as the wave moves.

8. Frequency, Amplitude, Wavelength

9. Speed
frequency (cycles/sec)
speed (m/sec)
v = f l
wavelength (m)